There's not long to wait until nighttime sky watchers can enjoy another stunning supermoon.

The last one occurred on the night of January 1 - a beautiful way to start 2018.

According to NASA, the next supermoon in 2018 will be on the night of January 31, reports The Mirror Online.

What's more, because it's the second full moon in the same calender month, it technically becomes a "blue moon" - an event that only happens every couple of years.

Supermoons are so-called because they appear larger and brighter in the sky than a regular full moon.

"The supermoons are a great opportunity for people to start looking at the moon, not just that once but every chance they have,” said Noah Petro, a research scientist from NASA’s Goddard Space Flight Center.

(Image: Reuters)

When can I see it?

Look up on the nights of January 31 and even February 1 at about 2am (GMT) for the best view. There's a window of opportunity if there are clear skies.

Make sure you're as far away from light pollution as possible.

What is a supermoon?

A supermoon usually takes place every one to two years, when the full moon coincides with its closest point to Earth during its monthly orbit.

Because the moon has an elliptical orbit, one side - called the perigee - is about 48,280 km (30,000 miles) closer to Earth than the other side (the apogee).

When the sun, the moon, and Earth line up as the moon orbits Earth, that's known as syzygy (definitely something you want to keep in your back pocket for your next Scrabble match).

When this Earth-Moon-Sun system occurs with the perigee side of the moon facing us, and the moon happens to be on the opposite side of Earth from the sun, we get what’s called a perigee-syzygy.

That causes the moon to appear much bigger and brighter in our sky than usual, and it's referred to as a supermoon - or more technically, a perigee moon.

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What is a blue moon?

It's the rare moment when a second full moon appears during one calendar month, although its traditional meaning is slightly different.